Abstract. This paper presents estimates of current and future global anthropogenic
methane emissions, their technical mitigation potential and associated costs
for the period 2005 to 2030. The analysis uses the GAINS model framework to
estimate emissions, mitigation potentials and costs for all major sources of
anthropogenic methane for 83 countries/regions, which are aggregated to
produce global estimates. Global emissions are estimated at 323 Mt methane
in 2005, with an expected increase to 414 Mt methane in 2030. The technical
mitigation potential is estimated at 195 Mt methane in 2030, whereof about
80 percent is found attainable at a marginal cost less than 20 Euro t−1
CO2eq when using a social planner cost perspective. With a private
investor cost perspective, the corresponding fraction is only 30 percent.
Major uncertainty sources in emission estimates are identified and
discussed.